ATI Fire GL V3100 and Dual display

[Alex Deucher]

On 7/22/05, Wes Bauske <wsb at paralleldata.com> wrote:
> 
> 
> Alex Deucher wrote:
> >>
> >>After looking at the log closely, I realized that the radeon driver is switching around
> >>what is the primary vs secondary "port". The Sceptre monitor is really the primary
> >>display that the BIOS initializes and the Linux console runs on. The EN7100e is on the
> >>DVI->VGA adapter and is not initialized at boot. So, this appears to be the problem.
> >>How to tell the driver to swap them around?
> >>
> >
> >
> > are you still having problems getting the screen to come up or are
> > your heads just swapped?  if it's just the heads that are swapped,
> > switch the CRT2Position option to RightOf.  If you are still having
> > problems getting one of the displays to show an image add:
> > Option "MonitorLayout" "CRT, CRT"
> > to your device section. That will force both DACs on.  You may also
> > want to check your dvi-vga adapter.  sometimes they can flake out.
> >
> > Alex
> >
> 
> The monitor on the DVI port is blank.
> 
> I tried the MonitorLayout option and it didn't seem to make a difference other than
> the radeon driver complained the 2nd value was incorrect.

that's odd.  it shouldn't.  can you send me the message?  what did you
specify?  the only valid options are:

CRT - vga connectors, dvi->vga adapters, etc. anything driven by a DAC
TMDS - digital DVI connections, digital only.
LVDS - laptop flatpanels

> 
> I'll try the RightOf setting this afternoon to see if that helps.
> 
> The DVI-VGA adpter was working last week on another system. I'll fire that system
> up later today and make sure the DVI-VGA adapter is still working but I've seen
> this behavior on multiple system combinations, with multiple DVI-VGA adapters.
> 
> Just to clarify, you say this "forces" both DAC's on. Does that also mean the driver
> will do a soft reset using the "int10" module on both ports? I still think the driver
> is confused which port is primary vs secondary. Think I need to go look at the driver
> source to see what ports are reset and under what conditions.

it forces it on in that it turns the controller on and turns on the
DAC to drive it regardless of whether there is a monitor detected on
that port or not.  There is no post done unless the card is not the
primary, I think.  Regardless, there is only one graphics chip so the
second output is never posted, either the card is posted or it isn't. 
Also since everything is done via direct register writes, there's
really no need for the bios once the card has been initially posted. 
If one output works, the other should too especially if you are
forcing it on.

Alex

> 
> Wes
> 
> >
> >
> >>Any help appreciated.
> >>
> >>Wes
> >>
> >
> >
> >